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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const arr = [
        {
          name: "张三",
          salary: 10000,
        },
        {
          name: "李四",
          salary: 10000,
        },
        {
          name: "王五",
          salary: 20000,
        },
      ];
      // 计算涨薪30%后，一共需要支出多少？

      // 注意,需要初始值，0开始累加
      // 如果没有初始值,pre ==> {name;"",salary:10000}
      const money = arr.reduce(function (pre, cur) {
        // const { salary } = cur;
        // console.log(salary);
        console.log(pre);
        return pre + cur.salary * 0.3;
      });

      console.log(money);
      // 箭头函数
      const money2 = arr.reduce((pre, cur) => pre + cur.salary * 0.3, 0);
      console.log(money2);
    </script>
  </body>
</html>
